During compinling I got a note, that --enable-intl is an unknown option.
The rest was fine.

Now, when I activate fast-cgi -> 5.2.17 for an old drupal site (which displays fine with 5.3 but brings php5.3 incomp. errors) the web renders an error 500.
Debugging is hard and the only hint I find is the following error (error.log):